Space Frontier Foundation
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Space advocacy
Moon Society
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Space Studies Institute
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Colonization of Mars
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Steady-state economy
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British Interplanetary Society
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James Hughes (sociologist)
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Colonization of the Moon
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Gerard K. O'Neill
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Space law
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Vision for Space Exploration
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William Proxmire
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National Space Institute
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Mining the Sky
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Bruce Boxleitner
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The Case for Mars
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Engines of Creation
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National Space Society
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International Astronautical Federation
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Cosmos 1
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The Planetary Society
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Lance Bass
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Nichelle Nichols
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Space Race
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Tom Hanks
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Space colonization
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Space exploration
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Mars Society
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